Galio's W doesn't proc Windspeaker's Blessing
At the moment (Patch 5.23), Galio's Bulwark (W) is not proccing Windspeaker's Blessing.
Galio's Bulwark reads: "Galio shields an allied champion, increasing their Armor and Magic Resistance, and restoring Galio's Health each time that Champion suffers damage."
Windspeaker's Blessing reads: "Your shields and heals are 10% stronger. Additionally, your shields and heals on other allies increase their resistances by 15% for 3 seconds."
I know Galio's Bulwark isn't a traditional white health shield, but neither is Morgana's Black Shield and it procs Windspeaker's Blessing. The wording should be adjusted on Bulwark if Windspeaker's Blessing isn't meant to be procced because it is misleading.